Java 使用ImageWriter保存为JPEG时将alpha通道转换为白色
我正在使用以下代码片段将png图像转换为jpeg:Java 使用ImageWriter保存为JPEG时将alpha通道转换为白色,java,image,png,awt,alpha-transparency,Java,Image,Png,Awt,Alpha Transparency,我正在使用以下代码片段将png图像转换为jpeg: ByteArrayOutputStream image1baos = new ByteArrayOutputStream(); image1 = resizeImage(cropImage(image1, rect1), 150); ImageWriter writer = null; Iterator<ImageWriter> iter = ImageIO.getImageWritersByFormatName("jpg");
ByteArrayOutputStream image1baos = new ByteArrayOutputStream();
image1 = resizeImage(cropImage(image1, rect1), 150);
ImageWriter writer = null;
Iterator<ImageWriter> iter = ImageIO.getImageWritersByFormatName("jpg");
if (iter.hasNext()) {
writer = (ImageWriter) iter.next();
}
ImageOutputStream ios = ImageIO.createImageOutputStream(image1baos);
writer.setOutput(ios);
// set the compression quality
ImageWriteParam iwparam = new MyImageWriteParam();
iwparam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
iwparam.setCompressionQuality(0.2f);
// write image 1
writer.write(null, new IIOImage(image1, null, null), iwparam);
ios.flush();
// set image 1
c.getItem1().setImageData(image1baos.toByteArray());
ByteArrayOutputStream image1baos=newbytearrayoutputstream();
image1=大小图像(cropImage(image1,rect1),150);
ImageWriter=null;
迭代器iter=ImageIO.getImageWritersByFormatName(“jpg”);
if(iter.hasNext()){
writer=(ImageWriter)iter.next();
}
ImageOutputStream ios=ImageIO.createImageOutputStream(image1baos);
writer.setOutput(ios);
//设置压缩质量
ImageWriteParam iwparam=新的MyImageWriteParam();
iwparam.setCompressionMode(ImageWriteParam.MODE_显式);
iwparam.setCompressionQuality(0.2f);
//写图片1
writer.write(null,新IIOImage(image1,null,null),iwparam);
ios.flush();
//设置图像1
c、 getItem1().setImageData(image1baos.toByteArray());
我想将alpha通道转换为白色,而不是默认情况下的黑色,但我找不到一种方法。非常感谢您的帮助 我的解决方案很难看,可能很慢,但它是一个解决方案:)
buffereImage img=
for(inti=0;i>24&0xFF;
int r=coli>>16&0xFF;
int g=coli>>8&0xFF;
int b=coli&0xFF;
coli&=~0xFFFFFFFF;
//在您的情况下,对a、r、g和b执行您想要的操作:
a=0xFF;
//保存argb
大肠杆菌|=a
BufferedImage img = <your image>
for( int i = 0; i < img.getWidth( ); i++ )
for( int j = 0; j < img.getHeight( ); j++ ) {
// get argb from pixel
int coli = img.getRGB( i, j );
int a = coli >> 24 & 0xFF;
int r = coli >> 16 & 0xFF;
int g = coli >> 8 & 0xFF;
int b = coli & 0xFF;
coli &= ~0xFFFFFFFF;
// do what you want with a, r, g and b, in your case :
a = 0xFF;
// save argb
coli |= a << 24;
coli |= r << 16;
coli |= g << 8;
coli |= b << 0;
img.setRGB( i, j, coli );
}
}